| City | Population (000) | Annual ambient PM2.5 concentration* (µg/m3) |
| Tangier | 1,005 | 22 |
| Marrakech | 981 | 20 |
| Casablanca | 3,360 | 20 |
| Mohammedia | 289 | 18 |
| Settat | 218 | 17 |
| Fès | 1,130 | 16 |
| Benslimane | 114 | 13 |
| Khouribga | 378 | 12 |
| Agadir | 508 | 5 |
| El-Jadida | 312 | 4 |
| Salé | 916 | 4 |
| Safi | 346 | 3 |